import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '@/components/Login'
import Home from '@/components/Home'
import Welcome from '@/components/Welcome'
import Users from '@/components/user/Users'
import Rights from '@/components/power/Rights'
import Roles from '@/components/power/Roles'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [
      { path: '/welcome', component: Welcome },
      { path: '/users', component: Users },
      { path: '/rights', component: Rights },
      { path: '/roles', component: Roles },

    ]
  },
]

const router = new VueRouter({
  routes
})

/*
  参数：
    1. to - 将要访问的路径
    2. from - 从哪个路径跳转来
    3. next - 是一个函数，表示放行
      next() - 放行
      next('路由') - 强制跳转
*/
// 挂载路由导航守卫 -- 登录验证
router.beforeEach((to, from, next) => {
  if (to.path === '/login') return next()
  const tokenStr = window.sessionStorage.getItem('token')  // 获取 token
  if (!tokenStr) return next('/login')  // token 不存在强制跳转
  next()
})

export default router
